drivers/net/wireless/b43/xmit.c

   1 /*
   2
   3   Broadcom B43 wireless driver
   4
   5   Transmission (TX/RX) related functions.
   6
   7   Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
   8   Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it>
   9   Copyright (C) 2005, 2006 Michael Buesch <mb@bu3sch.de>
  10   Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
  11   Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
  12
  13   This program is free software; you can redistribute it and/or modify
  14   it under the terms of the GNU General Public License as published by
  15   the Free Software Foundation; either version 2 of the License, or
  16   (at your option) any later version.
  17
  18   This program is distributed in the hope that it will be useful,
  19   but WITHOUT ANY WARRANTY; without even the implied warranty of
  20   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21   GNU General Public License for more details.
  22
  23   You should have received a copy of the GNU General Public License
  24   along with this program; see the file COPYING.  If not, write to
  25   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  26   Boston, MA 02110-1301, USA.
  27
  28 */
  29
  30 #include "xmit.h"
  31 #include "phy.h"
  32 #include "dma.h"
  33 #include "pio.h"
  34
  35
  36 /* Extract the bitrate index out of a CCK PLCP header. */
  37 static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp)
  38 {
  39         switch (plcp->raw[0]) {
  40         case 0x0A:
  41                 return 0;
  42         case 0x14:
  43                 return 1;
  44         case 0x37:
  45                 return 2;
  46         case 0x6E:
  47                 return 3;
  48         }
  49         B43_WARN_ON(1);
  50         return -1;
  51 }
  52
  53 /* Extract the bitrate index out of an OFDM PLCP header. */
  54 static u8 b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool aphy)
  55 {
  56         int base = aphy ? 0 : 4;
  57
  58         switch (plcp->raw[0] & 0xF) {
  59         case 0xB:
  60                 return base + 0;
  61         case 0xF:
  62                 return base + 1;
  63         case 0xA:
  64                 return base + 2;
  65         case 0xE:
  66                 return base + 3;
  67         case 0x9:
  68                 return base + 4;
  69         case 0xD:
  70                 return base + 5;
  71         case 0x8:
  72                 return base + 6;
  73         case 0xC:
  74                 return base + 7;
  75         }
  76         B43_WARN_ON(1);
  77         return -1;
  78 }
  79
  80 u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
  81 {
  82         switch (bitrate) {
  83         case B43_CCK_RATE_1MB:
  84                 return 0x0A;
  85         case B43_CCK_RATE_2MB:
  86                 return 0x14;
  87         case B43_CCK_RATE_5MB:
  88                 return 0x37;
  89         case B43_CCK_RATE_11MB:
  90                 return 0x6E;
  91         }
  92         B43_WARN_ON(1);
  93         return 0;
  94 }
  95
  96 u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
  97 {
  98         switch (bitrate) {
  99         case B43_OFDM_RATE_6MB:
 100                 return 0xB;
 101         case B43_OFDM_RATE_9MB:
 102                 return 0xF;
 103         case B43_OFDM_RATE_12MB:
 104                 return 0xA;
 105         case B43_OFDM_RATE_18MB:
 106                 return 0xE;
 107         case B43_OFDM_RATE_24MB:
 108                 return 0x9;
 109         case B43_OFDM_RATE_36MB:
 110                 return 0xD;
 111         case B43_OFDM_RATE_48MB:
 112                 return 0x8;
 113         case B43_OFDM_RATE_54MB:
 114                 return 0xC;
 115         }
 116         B43_WARN_ON(1);
 117         return 0;
 118 }
 119
 120 void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
 121                            const u16 octets, const u8 bitrate)
 122 {
 123         __le32 *data = &(plcp->data);
 124         __u8 *raw = plcp->raw;
 125
 126         if (b43_is_ofdm_rate(bitrate)) {
 127                 u32 d;
 128
 129                 d = b43_plcp_get_ratecode_ofdm(bitrate);
 130                 B43_WARN_ON(octets & 0xF000);
 131                 d |= (octets << 5);
 132                 *data = cpu_to_le32(d);
 133         } else {
 134                 u32 plen;
 135
 136                 plen = octets * 16 / bitrate;
 137                 if ((octets * 16 % bitrate) > 0) {
 138                         plen++;
 139                         if ((bitrate == B43_CCK_RATE_11MB)
 140                             && ((octets * 8 % 11) < 4)) {
 141                                 raw[1] = 0x84;
 142                         } else
 143                                 raw[1] = 0x04;
 144                 } else
 145                         raw[1] = 0x04;
 146                 *data |= cpu_to_le32(plen << 16);
 147                 raw[0] = b43_plcp_get_ratecode_cck(bitrate);
 148         }
 149 }
 150
 151 static u8 b43_calc_fallback_rate(u8 bitrate)
 152 {
 153         switch (bitrate) {
 154         case B43_CCK_RATE_1MB:
 155                 return B43_CCK_RATE_1MB;
 156         case B43_CCK_RATE_2MB:
 157                 return B43_CCK_RATE_1MB;
 158         case B43_CCK_RATE_5MB:
 159                 return B43_CCK_RATE_2MB;
 160         case B43_CCK_RATE_11MB:
 161                 return B43_CCK_RATE_5MB;
 162         case B43_OFDM_RATE_6MB:
 163                 return B43_CCK_RATE_5MB;
 164         case B43_OFDM_RATE_9MB:
 165                 return B43_OFDM_RATE_6MB;
 166         case B43_OFDM_RATE_12MB:
 167                 return B43_OFDM_RATE_9MB;
 168         case B43_OFDM_RATE_18MB:
 169                 return B43_OFDM_RATE_12MB;
 170         case B43_OFDM_RATE_24MB:
 171                 return B43_OFDM_RATE_18MB;
 172         case B43_OFDM_RATE_36MB:
 173                 return B43_OFDM_RATE_24MB;
 174         case B43_OFDM_RATE_48MB:
 175                 return B43_OFDM_RATE_36MB;
 176         case B43_OFDM_RATE_54MB:
 177                 return B43_OFDM_RATE_48MB;
 178         }
 179         B43_WARN_ON(1);
 180         return 0;
 181 }
 182
 183 /* Generate a TX data header. */
 184 int b43_generate_txhdr(struct b43_wldev *dev,
 185                        u8 *_txhdr,
 186                        const unsigned char *fragment_data,
 187                        unsigned int fragment_len,
 188                        const struct ieee80211_tx_control *txctl,
 189                        u16 cookie)
 190 {
 191         struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
 192         const struct b43_phy *phy = &dev->phy;
 193         const struct ieee80211_hdr *wlhdr =
 194             (const struct ieee80211_hdr *)fragment_data;
 195         int use_encryption = (!(txctl->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT));
 196         u16 fctl = le16_to_cpu(wlhdr->frame_control);
 197         struct ieee80211_rate *fbrate;
 198         u8 rate, rate_fb;
 199         int rate_ofdm, rate_fb_ofdm;
 200         unsigned int plcp_fragment_len;
 201         u32 mac_ctl = 0;
 202         u16 phy_ctl = 0;
 203         u8 extra_ft = 0;
 204
 205         memset(txhdr, 0, sizeof(*txhdr));
 206
 207         WARN_ON(!txctl->tx_rate);
 208         rate = txctl->tx_rate ? txctl->tx_rate->hw_value : B43_CCK_RATE_1MB;
 209         rate_ofdm = b43_is_ofdm_rate(rate);
 210         fbrate = txctl->alt_retry_rate ? : txctl->tx_rate;
 211         rate_fb = fbrate->hw_value;
 212         rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);
 213
 214         if (rate_ofdm)
 215                 txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
 216         else
 217                 txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
 218         txhdr->mac_frame_ctl = wlhdr->frame_control;
 219         memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
 220
 221         /* Calculate duration for fallback rate */
 222         if ((rate_fb == rate) ||
 223             (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
 224             (wlhdr->duration_id == cpu_to_le16(0))) {
 225                 /* If the fallback rate equals the normal rate or the
 226                  * dur_id field contains an AID, CFP magic or 0,
 227                  * use the original dur_id field. */
 228                 txhdr->dur_fb = wlhdr->duration_id;
 229         } else {
 230                 txhdr->dur_fb = ieee80211_generic_frame_duration(dev->wl->hw,
 231                                                                  txctl->vif,
 232                                                                  fragment_len,
 233                                                                  fbrate);
 234         }
 235
 236         plcp_fragment_len = fragment_len + FCS_LEN;
 237         if (use_encryption) {
 238                 u8 key_idx = (u16) (txctl->key_idx);
 239                 struct b43_key *key;
 240                 int wlhdr_len;
 241                 size_t iv_len;
 242
 243                 B43_WARN_ON(key_idx >= dev->max_nr_keys);
 244                 key = &(dev->key[key_idx]);
 245
 246                 if (unlikely(!key->keyconf)) {
 247                         /* This key is invalid. This might only happen
 248                          * in a short timeframe after machine resume before
 249                          * we were able to reconfigure keys.
 250                          * Drop this packet completely. Do not transmit it
 251                          * unencrypted to avoid leaking information. */
 252                         return -ENOKEY;
 253                 }
 254
 255                 /* Hardware appends ICV. */
 256                 plcp_fragment_len += txctl->icv_len;
 257
 258                 key_idx = b43_kidx_to_fw(dev, key_idx);
 259                 mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
 260                            B43_TXH_MAC_KEYIDX;
 261                 mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
 262                            B43_TXH_MAC_KEYALG;
 263                 wlhdr_len = ieee80211_get_hdrlen(fctl);
 264                 iv_len = min((size_t) txctl->iv_len,
 265                              ARRAY_SIZE(txhdr->iv));
 266                 memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
 267         }
 268         if (b43_is_old_txhdr_format(dev)) {
 269                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->old_format.plcp),
 270                                       plcp_fragment_len, rate);
 271         } else {
 272                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->new_format.plcp),
 273                                       plcp_fragment_len, rate);
 274         }
 275         b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
 276                               plcp_fragment_len, rate_fb);
 277
 278         /* Extra Frame Types */
 279         if (rate_fb_ofdm)
 280                 extra_ft |= B43_TXH_EFT_FB_OFDM;
 281         else
 282                 extra_ft |= B43_TXH_EFT_FB_CCK;
 283
 284         /* Set channel radio code. Note that the micrcode ORs 0x100 to
 285          * this value before comparing it to the value in SHM, if this
 286          * is a 5Ghz packet.
 287          */
 288         txhdr->chan_radio_code = phy->channel;
 289
 290         /* PHY TX Control word */
 291         if (rate_ofdm)
 292                 phy_ctl |= B43_TXH_PHY_ENC_OFDM;
 293         else
 294                 phy_ctl |= B43_TXH_PHY_ENC_CCK;
 295         if (txctl->flags & IEEE80211_TXCTL_SHORT_PREAMBLE)
 296                 phy_ctl |= B43_TXH_PHY_SHORTPRMBL;
 297
 298         switch (b43_ieee80211_antenna_sanitize(dev, txctl->antenna_sel_tx)) {
 299         case 0: /* Default */
 300                 phy_ctl |= B43_TXH_PHY_ANT01AUTO;
 301                 break;
 302         case 1: /* Antenna 0 */
 303                 phy_ctl |= B43_TXH_PHY_ANT0;
 304                 break;
 305         case 2: /* Antenna 1 */
 306                 phy_ctl |= B43_TXH_PHY_ANT1;
 307                 break;
 308         case 3: /* Antenna 2 */
 309                 phy_ctl |= B43_TXH_PHY_ANT2;
 310                 break;
 311         case 4: /* Antenna 3 */
 312                 phy_ctl |= B43_TXH_PHY_ANT3;
 313                 break;
 314         default:
 315                 B43_WARN_ON(1);
 316         }
 317
 318         /* MAC control */
 319         if (!(txctl->flags & IEEE80211_TXCTL_NO_ACK))
 320                 mac_ctl |= B43_TXH_MAC_ACK;
 321         if (!(((fctl & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
 322               ((fctl & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)))
 323                 mac_ctl |= B43_TXH_MAC_HWSEQ;
 324         if (txctl->flags & IEEE80211_TXCTL_FIRST_FRAGMENT)
 325                 mac_ctl |= B43_TXH_MAC_STMSDU;
 326         if (phy->type == B43_PHYTYPE_A)
 327                 mac_ctl |= B43_TXH_MAC_5GHZ;
 328         if (txctl->flags & IEEE80211_TXCTL_LONG_RETRY_LIMIT)
 329                 mac_ctl |= B43_TXH_MAC_LONGFRAME;
 330
 331         /* Generate the RTS or CTS-to-self frame */
 332         if ((txctl->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
 333             (txctl->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
 334                 unsigned int len;
 335                 struct ieee80211_hdr *hdr;
 336                 int rts_rate, rts_rate_fb;
 337                 int rts_rate_ofdm, rts_rate_fb_ofdm;
 338                 struct b43_plcp_hdr6 *plcp;
 339
 340                 WARN_ON(!txctl->rts_cts_rate);
 341                 rts_rate = txctl->rts_cts_rate ? txctl->rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
 342                 rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
 343                 rts_rate_fb = b43_calc_fallback_rate(rts_rate);
 344                 rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);
 345
 346                 if (txctl->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) {
 347                         struct ieee80211_cts *cts;
 348
 349                         if (b43_is_old_txhdr_format(dev)) {
 350                                 cts = (struct ieee80211_cts *)
 351                                         (txhdr->old_format.rts_frame);
 352                         } else {
 353                                 cts = (struct ieee80211_cts *)
 354                                         (txhdr->new_format.rts_frame);
 355                         }
 356                         ieee80211_ctstoself_get(dev->wl->hw, txctl->vif,
 357                                                 fragment_data, fragment_len,
 358                                                 txctl, cts);
 359                         mac_ctl |= B43_TXH_MAC_SENDCTS;
 360                         len = sizeof(struct ieee80211_cts);
 361                 } else {
 362                         struct ieee80211_rts *rts;
 363
 364                         if (b43_is_old_txhdr_format(dev)) {
 365                                 rts = (struct ieee80211_rts *)
 366                                         (txhdr->old_format.rts_frame);
 367                         } else {
 368                                 rts = (struct ieee80211_rts *)
 369                                         (txhdr->new_format.rts_frame);
 370                         }
 371                         ieee80211_rts_get(dev->wl->hw, txctl->vif,
 372                                           fragment_data, fragment_len,
 373                                           txctl, rts);
 374                         mac_ctl |= B43_TXH_MAC_SENDRTS;
 375                         len = sizeof(struct ieee80211_rts);
 376                 }
 377                 len += FCS_LEN;
 378
 379                 /* Generate the PLCP headers for the RTS/CTS frame */
 380                 if (b43_is_old_txhdr_format(dev))
 381                         plcp = &txhdr->old_format.rts_plcp;
 382                 else
 383                         plcp = &txhdr->new_format.rts_plcp;
 384                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 385                                       len, rts_rate);
 386                 plcp = &txhdr->rts_plcp_fb;
 387                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 388                                       len, rts_rate_fb);
 389
 390                 if (b43_is_old_txhdr_format(dev)) {
 391                         hdr = (struct ieee80211_hdr *)
 392                                 (&txhdr->old_format.rts_frame);
 393                 } else {
 394                         hdr = (struct ieee80211_hdr *)
 395                                 (&txhdr->new_format.rts_frame);
 396                 }
 397                 txhdr->rts_dur_fb = hdr->duration_id;
 398
 399                 if (rts_rate_ofdm) {
 400                         extra_ft |= B43_TXH_EFT_RTS_OFDM;
 401                         txhdr->phy_rate_rts =
 402                             b43_plcp_get_ratecode_ofdm(rts_rate);
 403                 } else {
 404                         extra_ft |= B43_TXH_EFT_RTS_CCK;
 405                         txhdr->phy_rate_rts =
 406                             b43_plcp_get_ratecode_cck(rts_rate);
 407                 }
 408                 if (rts_rate_fb_ofdm)
 409                         extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
 410                 else
 411                         extra_ft |= B43_TXH_EFT_RTSFB_CCK;
 412         }
 413
 414         /* Magic cookie */
 415         if (b43_is_old_txhdr_format(dev))
 416                 txhdr->old_format.cookie = cpu_to_le16(cookie);
 417         else
 418                 txhdr->new_format.cookie = cpu_to_le16(cookie);
 419
 420         /* Apply the bitfields */
 421         txhdr->mac_ctl = cpu_to_le32(mac_ctl);
 422         txhdr->phy_ctl = cpu_to_le16(phy_ctl);
 423         txhdr->extra_ft = extra_ft;
 424
 425         return 0;
 426 }
 427
 428 static s8 b43_rssi_postprocess(struct b43_wldev *dev,
 429                                u8 in_rssi, int ofdm,
 430                                int adjust_2053, int adjust_2050)
 431 {
 432         struct b43_phy *phy = &dev->phy;
 433         s32 tmp;
 434
 435         switch (phy->radio_ver) {
 436         case 0x2050:
 437                 if (ofdm) {
 438                         tmp = in_rssi;
 439                         if (tmp > 127)
 440                                 tmp -= 256;
 441                         tmp *= 73;
 442                         tmp /= 64;
 443                         if (adjust_2050)
 444                                 tmp += 25;
 445                         else
 446                                 tmp -= 3;
 447                 } else {
 448                         if (dev->dev->bus->sprom.
 449                             boardflags_lo & B43_BFL_RSSI) {
 450                                 if (in_rssi > 63)
 451                                         in_rssi = 63;
 452                                 tmp = phy->nrssi_lt[in_rssi];
 453                                 tmp = 31 - tmp;
 454                                 tmp *= -131;
 455                                 tmp /= 128;
 456                                 tmp -= 57;
 457                         } else {
 458                                 tmp = in_rssi;
 459                                 tmp = 31 - tmp;
 460                                 tmp *= -149;
 461                                 tmp /= 128;
 462                                 tmp -= 68;
 463                         }
 464                         if (phy->type == B43_PHYTYPE_G && adjust_2050)
 465                                 tmp += 25;
 466                 }
 467                 break;
 468         case 0x2060:
 469                 if (in_rssi > 127)
 470                         tmp = in_rssi - 256;
 471                 else
 472                         tmp = in_rssi;
 473                 break;
 474         default:
 475                 tmp = in_rssi;
 476                 tmp -= 11;
 477                 tmp *= 103;
 478                 tmp /= 64;
 479                 if (adjust_2053)
 480                         tmp -= 109;
 481                 else
 482                         tmp -= 83;
 483         }
 484
 485         return (s8) tmp;
 486 }
 487
 488 //TODO
 489 #if 0
 490 static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
 491 {
 492         struct b43_phy *phy = &dev->phy;
 493         s8 ret;
 494
 495         if (phy->type == B43_PHYTYPE_A) {
 496                 //TODO: Incomplete specs.
 497                 ret = 0;
 498         } else
 499                 ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);
 500
 501         return ret;
 502 }
 503 #endif
 504
 505 void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
 506 {
 507         struct ieee80211_rx_status status;
 508         struct b43_plcp_hdr6 *plcp;
 509         struct ieee80211_hdr *wlhdr;
 510         const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
 511         u16 fctl;
 512         u16 phystat0, phystat3, chanstat, mactime;
 513         u32 macstat;
 514         u16 chanid;
 515         u16 phytype;
 516         int padding;
 517
 518         memset(&status, 0, sizeof(status));
 519
 520         /* Get metadata about the frame from the header. */
 521         phystat0 = le16_to_cpu(rxhdr->phy_status0);
 522         phystat3 = le16_to_cpu(rxhdr->phy_status3);
 523         macstat = le32_to_cpu(rxhdr->mac_status);
 524         mactime = le16_to_cpu(rxhdr->mac_time);
 525         chanstat = le16_to_cpu(rxhdr->channel);
 526         phytype = chanstat & B43_RX_CHAN_PHYTYPE;
 527
 528         if (macstat & B43_RX_MAC_FCSERR)
 529                 dev->wl->ieee_stats.dot11FCSErrorCount++;
 530         if (macstat & B43_RX_MAC_DECERR) {
 531                 /* Decryption with the given key failed.
 532                  * Drop the packet. We also won't be able to decrypt it with
 533                  * the key in software. */
 534                 goto drop;
 535         }
 536
 537         /* Skip PLCP and padding */
 538         padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
 539         if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
 540                 b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
 541                 goto drop;
 542         }
 543         plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
 544         skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
 545         /* The skb contains the Wireless Header + payload data now */
 546         if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */  + FCS_LEN))) {
 547                 b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
 548                 goto drop;
 549         }
 550         wlhdr = (struct ieee80211_hdr *)(skb->data);
 551         fctl = le16_to_cpu(wlhdr->frame_control);
 552
 553         if (macstat & B43_RX_MAC_DEC) {
 554                 unsigned int keyidx;
 555                 int wlhdr_len;
 556
 557                 keyidx = ((macstat & B43_RX_MAC_KEYIDX)
 558                           >> B43_RX_MAC_KEYIDX_SHIFT);
 559                 /* We must adjust the key index here. We want the "physical"
 560                  * key index, but the ucode passed it slightly different.
 561                  */
 562                 keyidx = b43_kidx_to_raw(dev, keyidx);
 563                 B43_WARN_ON(keyidx >= dev->max_nr_keys);
 564
 565                 if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
 566                         wlhdr_len = ieee80211_get_hdrlen(fctl);
 567                         if (unlikely(skb->len < (wlhdr_len + 3))) {
 568                                 b43dbg(dev->wl,
 569                                        "RX: Packet size underrun (3)\n");
 570                                 goto drop;
 571                         }
 572                         status.flag |= RX_FLAG_DECRYPTED;
 573                 }
 574         }
 575
 576         /* Link quality statistics */
 577         status.noise = dev->stats.link_noise;
 578         if ((chanstat & B43_RX_CHAN_PHYTYPE) == B43_PHYTYPE_N) {
 579 //              s8 rssi = max(rxhdr->power0, rxhdr->power1);
 580                 //TODO: Find out what the rssi value is (dBm or percentage?)
 581                 //      and also find out what the maximum possible value is.
 582                 //      Fill status.ssi and status.signal fields.
 583         } else {
 584                 status.ssi = b43_rssi_postprocess(dev, rxhdr->jssi,
 585                                                   (phystat0 & B43_RX_PHYST0_OFDM),
 586                                                   (phystat0 & B43_RX_PHYST0_GAINCTL),
 587                                                   (phystat3 & B43_RX_PHYST3_TRSTATE));
 588                 /* the next line looks wrong, but is what mac80211 wants */
 589                 status.signal = (rxhdr->jssi * 100) / B43_RX_MAX_SSI;
 590         }
 591
 592         if (phystat0 & B43_RX_PHYST0_OFDM)
 593                 status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
 594                                                 phytype == B43_PHYTYPE_A);
 595         else
 596                 status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
 597         status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);
 598
 599         /*
 600          * All frames on monitor interfaces and beacons always need a full
 601          * 64-bit timestamp. Monitor interfaces need it for diagnostic
 602          * purposes and beacons for IBSS merging.
 603          * This code assumes we get to process the packet within 16 bits
 604          * of timestamp, i.e. about 65 milliseconds after the PHY received
 605          * the first symbol.
 606          */
 607         if (((fctl & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
 608             == (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON)) ||
 609             dev->wl->radiotap_enabled) {
 610                 u16 low_mactime_now;
 611
 612                 b43_tsf_read(dev, &status.mactime);
 613                 low_mactime_now = status.mactime;
 614                 status.mactime = status.mactime & ~0xFFFFULL;
 615                 status.mactime += mactime;
 616                 if (low_mactime_now <= mactime)
 617                         status.mactime -= 0x10000;
 618                 status.flag |= RX_FLAG_TSFT;
 619         }
 620
 621         chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
 622         switch (chanstat & B43_RX_CHAN_PHYTYPE) {
 623         case B43_PHYTYPE_A:
 624                 status.band = IEEE80211_BAND_5GHZ;
 625                 B43_WARN_ON(1);
 626                 /* FIXME: We don't really know which value the "chanid" contains.
 627                  *        So the following assignment might be wrong. */
 628                 status.freq = b43_channel_to_freq_5ghz(chanid);
 629                 break;
 630         case B43_PHYTYPE_G:
 631                 status.band = IEEE80211_BAND_2GHZ;
 632                 /* chanid is the radio channel cookie value as used
 633                  * to tune the radio. */
 634                 status.freq = chanid + 2400;
 635                 break;
 636         case B43_PHYTYPE_N:
 637                 /* chanid is the SHM channel cookie. Which is the plain
 638                  * channel number in b43. */
 639                 if (chanstat & B43_RX_CHAN_5GHZ) {
 640                         status.band = IEEE80211_BAND_5GHZ;
 641                         status.freq = b43_freq_to_channel_5ghz(chanid);
 642                 } else {
 643                         status.band = IEEE80211_BAND_2GHZ;
 644                         status.freq = b43_freq_to_channel_2ghz(chanid);
 645                 }
 646                 break;
 647         default:
 648                 B43_WARN_ON(1);
 649                 goto drop;
 650         }
 651
 652         dev->stats.last_rx = jiffies;
 653         ieee80211_rx_irqsafe(dev->wl->hw, skb, &status);
 654
 655         return;
 656 drop:
 657         b43dbg(dev->wl, "RX: Packet dropped\n");
 658         dev_kfree_skb_any(skb);
 659 }
 660
 661 void b43_handle_txstatus(struct b43_wldev *dev,
 662                          const struct b43_txstatus *status)
 663 {
 664         b43_debugfs_log_txstat(dev, status);
 665
 666         if (status->intermediate)
 667                 return;
 668         if (status->for_ampdu)
 669                 return;
 670         if (!status->acked)
 671                 dev->wl->ieee_stats.dot11ACKFailureCount++;
 672         if (status->rts_count) {
 673                 if (status->rts_count == 0xF)   //FIXME
 674                         dev->wl->ieee_stats.dot11RTSFailureCount++;
 675                 else
 676                         dev->wl->ieee_stats.dot11RTSSuccessCount++;
 677         }
 678
 679         if (b43_using_pio_transfers(dev))
 680                 b43_pio_handle_txstatus(dev, status);
 681         else
 682                 b43_dma_handle_txstatus(dev, status);
 683 }
 684
 685 /* Fill out the mac80211 TXstatus report based on the b43-specific
 686  * txstatus report data. This returns a boolean whether the frame was
 687  * successfully transmitted. */
 688 bool b43_fill_txstatus_report(struct ieee80211_tx_status *report,
 689                               const struct b43_txstatus *status)
 690 {
 691         bool frame_success = 1;
 692
 693         if (status->acked) {
 694                 /* The frame was ACKed. */
 695                 report->flags |= IEEE80211_TX_STATUS_ACK;
 696         } else {
 697                 /* The frame was not ACKed... */
 698                 if (!(report->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 699                         /* ...but we expected an ACK. */
 700                         frame_success = 0;
 701                         report->excessive_retries = 1;
 702                 }
 703         }
 704         if (status->frame_count == 0) {
 705                 /* The frame was not transmitted at all. */
 706                 report->retry_count = 0;
 707         } else
 708                 report->retry_count = status->frame_count - 1;
 709
 710         return frame_success;
 711 }
 712
 713 /* Stop any TX operation on the device (suspend the hardware queues) */
 714 void b43_tx_suspend(struct b43_wldev *dev)
 715 {
 716         if (b43_using_pio_transfers(dev))
 717                 b43_pio_tx_suspend(dev);
 718         else
 719                 b43_dma_tx_suspend(dev);
 720 }
 721
 722 /* Resume any TX operation on the device (resume the hardware queues) */
 723 void b43_tx_resume(struct b43_wldev *dev)
 724 {
 725         if (b43_using_pio_transfers(dev))
 726                 b43_pio_tx_resume(dev);
 727         else
 728                 b43_dma_tx_resume(dev);
 729 }